Friction Test

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Friction Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following activities is easier to perform on a drum of 10 kg?

A
Dragging the drum

B
Lifting the drum

C
Rolling the drum

D
All of the above need the same effort

Solution

Rolling friction is much less than sliding friction. So, rolling a drum is easier.
Question 2
1 / -0

Why does a meteor burn upon entering the earth's atmosphere?

A
Due to gravitational pull

B
Due to the heat of the earth

C
Due to solar radiation

D
Due to excess friction in air

Solution

Due to the very high speed of meteor when it enters the earth's atmosphere, the heat produced by the friction of air is very large which causes the meteor to burn.
Question 3
1 / -0

Why are the head of a match stick and the sides of a match box deliberately made rough?

A
To increase friction

B
To decrease friction

C
To increase the amount of heat

D
To decrease the amount of heat

Solution

Due to increased friction, greater frictional heat is produced in the match stick which thus lights up easily.
Question 4
1 / -0

Why are spikes provided in the shoes of athletes?

A
As a decoration

B
To increase friction

C
To decrease friction

D
To give shape

Solution

Spikes in the shoes increase friction and prevent slipping.
Question 5
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Which force prevents us from slipping while walking on the road?

A
Muscular force of our body

B
Gravitational pull by the earth

C
Frictional force

D
Balanced forces of nature

Solution

When we push the ground with our feet, the friction provides a forward reaction to our push and makes us move forward. (Walking on slippery ground is difficult because the frictional force is not enough to prevent slipping).
Question 6
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Which of the following statements is NOT true?

A
Friction can be reduced by converting sliding friction into rolling friction.

B
Friction in air and water can be reduced by streamlining the shape of the objects.

C
A polished surface will have less friction.

D
Friction can be reduced to zero.
Question 7
1 / -0

What will happen to a moving object if there is no friction?

A
The object will stop.

B
The object will keep on moving.

C
The object will change speed.

D
The object will change direction.

Solution

Friction opposes the relative motion of objects. In its absence, a moving object will not stop.
Question 8
1 / -0

Which of the following is a disadvantage of friction?

A
It enables the brakes of a car to work.

B
It allows us to hold a pen.

C
It helps us to sandpaper a table.

D
It wears out our shoes.

Solution

The wearing out of the soles of shoes is a disadvantage of friction.
Question 9
1 / -0

Which of the following is NOT an effect of frictional force?

A
The grooves of tyres flattened due to use

B
A rolling ball coming to a halt

C
Leaves falling from a tree

D
The holding of a pencil

Solution

Leaves falling from a tree onto the ground is due to the effect of gravitational force and not due to frictional force.
Question 10
1 / -0

Why are tyres made circular in shape?

A
It is easy to inflate circular tyres.

B
Rolling friction is less than sliding friction.

C
Circular tyres dissipate less heat.

D
Circular tyres easily slow down or stop a vehicle.

Solution

Since, rolling friction is less than sliding friction, the tyres are made circular instead of flat.

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Re-Attempt Weekly Quiz Competition

Friction Test - 4

Result

Friction Test - 4

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SHARING IS CARING

Question 1

Dragging the drum

Lifting the drum

Rolling the drum

All of the above need the same effort

Solution

Question 2

Due to gravitational pull

Due to the heat of the earth

Due to solar radiation

Due to excess friction in air

Solution

Question 3

To increase friction

To decrease friction

To increase the amount of heat

To decrease the amount of heat

Solution

Question 4

As a decoration

To increase friction

To decrease friction

To give shape

Solution

Question 5

Muscular force of our body

Gravitational pull by the earth

Frictional force

Balanced forces of nature

Solution

Question 6

Friction can be reduced by converting sliding friction into rolling friction.

Friction in air and water can be reduced by streamlining the shape of the objects.

A polished surface will have less friction.

Friction can be reduced to zero.

Question 7

The object will stop.

The object will keep on moving.

The object will change speed.

The object will change direction.

Solution

Question 8

It enables the brakes of a car to work.

It allows us to hold a pen.

It helps us to sandpaper a table.

It wears out our shoes.

Solution

Question 9

The grooves of tyres flattened due to use

A rolling ball coming to a halt

Leaves falling from a tree

The holding of a pencil

Solution

Question 10

It is easy to inflate circular tyres.

Rolling friction is less than sliding friction.

Circular tyres dissipate less heat.

Circular tyres easily slow down or stop a vehicle.

Solution

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